drm/i915: Flush execution tasklets before checking request status

Rather than flushing the submission tasklets just before we sleep, flush
before we check the request status. Ideally this gives us a moment to
process the tasklets after sleeping just before we timeout.

v2: Compromise by pushing the flush prior to the timeout, but after the
check on completion so that we do not further delay the ready client.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200205095441.1769599-1-chris@chris-wilson.co.uk

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